Convert mols C4H1O to mols H2O using the coefficients in the balanced equation.
Do the same to convert mols O2 to mols H2O.
Probably the answers for mols H2O will not agree which means one of them is wrong. The correct answer in limiting reagent problems is ALWAYS the smaller value and the reagent producing that value is the limiting reagent.
The g H2O = mols H2O x molar mass H2O